Modeling and simulation of self-locking drives

Classification of self-locking drives of any kind is described and a physical model of a self-locking kinematic pair, common for all them is proposed, together with a mathematical model suitable for computer simulation purposes. That model was used in a typical kinematic chain of a drive and dynamic behaviour studied on an example of a servomechanism driven by an electric d.c. motor. Four different drives (worm gears, crossed helical gears, screw drives and twinworm gear) were studied and selected results of simulation are presented in this paper.